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Texas Instruments LM318DRG4
- Part No.:
- LM318DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM318DRG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,472
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Product details
Overview
LM318DRG4 from Texas Instruments is a precision high-speed operational amplifier optimized for wide-bandwidth analog signal conditioning, active filtering, and fast-settling data acquisition systems. It delivers 15 MHz unity-gain bandwidth, ≥50 V/µs slew rate (min), ±5 V to ±20 V dual supply operation, internal frequency compensation, and input/output overload protection - enabling use in A/D converter front-ends and sample-and-hold circuits.
For engineers reviewing the LM318DRG4 datasheet, LM318DRG4 pinout, LM318DRG4 application, or LM318DRG4 equivalent, key selection criteria include its guaranteed minimum slew rate under load, DC accuracy (10 mV max input offset voltage at 25°C), thermal performance in SOIC-8 package (θJA = 97°C/W), and compatibility with feed-forward compensation for >150 V/µs inverting configurations.
Technical Context
The LM318DRG4 implements a bipolar input stage with internal unity-gain compensation, supporting stable operation without external components while permitting optional external compensation for enhanced dynamic performance. Its architecture enables fast settling to 0.1% error band in under 1 µs when a single capacitor is added.
It features balanced input bias current (≤500 nA over full temperature range), common-mode input range of ±11.5 V (at ±15 V supplies), and output swing of ±12 V into 2 kΩ - making it suitable for rail-to-rail–adjacent signal chains where speed and DC fidelity are jointly critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 15 MHz typical - supports stable closed-loop gain ≥1 up to 15 MHz without oscillation. |
| Slew Rate | ≥50 V/µs min - ensures faithful reproduction of fast-rising signals (e.g., 10 V step in ≤200 ns). |
| Input Offset Voltage | ≤10 mV at 25°C - limits DC error in precision amplification and sensor signal conditioning. |
| Supply Voltage Range | ±5 V to ±20 V - accommodates industrial and test equipment rails without external regulation. |
| Common-Mode Input Range | ±11.5 V (at ±15 V supplies) - allows direct interfacing with ±10 V sensor outputs or DACs. |
| Output Voltage Swing | ±12 V into 2 kΩ - delivers full-scale analog output with <1 V headroom per rail. |
| Thermal Resistance θJA | 97°C/W (SOIC-8) - defines maximum power dissipation (≈310 mW at 70°C ambient) before junction exceeds 150°C. |
Pinout & Package
LM318DRG4 is housed in an 8-pin SOIC (D) package with 1.27 mm lead pitch and 1.75 mm max height, compliant with JEDEC MS-012 variation AA and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BAL/COMP1 | Offset null / compensation terminal - used with external potentiometer for VIO trimming or capacitor for feed-forward compensation. |
| 2 | IN− | Inverting input - high-impedance node accepting feedback network or signal source in inverting configuration. |
| 3 | IN+ | Non-inverting input - high-impedance node for reference or signal injection in non-inverting configuration. |
| 4 | VCC− | Negative supply rail - must be connected to system ground or negative voltage; powers internal circuitry. |
| 5 | COMP2 | Compensation terminal - accepts external capacitor to reduce settling time or adjust stability margin. |
| 6 | VCC+ | Positive supply rail - powers internal circuitry; supports up to +20 V relative to VCC−. |
| 7 | OUT | Amplified output - drives loads ≥2 kΩ; capable of ±12 V swing with <0.1% distortion at 10 kHz. |
| 8 | BAL/COMP3 | Offset null / compensation terminal - paired with Pin 1 for symmetrical nulling or second-stage compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Enables immediate use in unity-gain buffer or gain-of-2 configuration without external capacitors. |
| Feed-forward compensation support | Allows slew rate boost to >150 V/µs in inverting mode via Pin 1/Pin 8 network - critical for pulse amplification. |
| Input/output overload protection | Prevents latch-up or damage during transient overvoltage events at inputs or short-circuit conditions at output. |
| Same pin assignments as general-purpose op amps | Direct drop-in replacement for LM741/LM324 in existing SOIC-8 layouts - no PCB redesign required. |
| Guaranteed performance over 0°C to 70°C | Specified electrical parameters (e.g., VIO, IIB, SR) validated across full commercial temperature range. |
Applications
| Active Filter Design | Sample-and-Hold Circuit |
|---|---|
|
Use Scenario: Second-order low-pass filter for anti-aliasing prior to 1 MSPS ADC sampling. IC Role / Device Role / Timing Role: High-speed transconductance amplifier implementing filter transfer function with minimal phase shift. Use Value: 15 MHz bandwidth ensures flat response up to Nyquist frequency; 50 V/µs slew rate prevents distortion on fast step inputs. |
Use Scenario: Hold capacitor charging and buffering in a 12-bit data acquisition system. IC Role / Device Role / Timing Role: Unity-gain buffer isolating hold capacitor from load while maintaining signal integrity during acquisition. Use Value: Settles to 0.1% in <1 µs with external compensation - reduces aperture uncertainty and improves effective resolution. |
| A/D Converter Front-End | Oscillator & Waveform Generation |
|
Use Scenario: Driving SAR ADC input with multiplexed sensor signals requiring fast settling and low noise. IC Role / Device Role / Timing Role: Precision gain stage and level shifter ensuring full-scale utilization of ADC reference range. Use Value: ±12 V output swing into 2 kΩ matches typical 12-bit ADC input ranges; 10 mV VIO avoids zero-scale error. |
Use Scenario: Triangle-wave generator in function generator IC using integrator/comparator topology. IC Role / Device Role / Timing Role: Integrator core with linear ramp generation dependent on slew rate and bandwidth. Use Value: 50 V/µs min slew rate enables clean 100 kHz triangle waves; internal compensation simplifies loop stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA211IDR | FET-input (0.8 pA IB), lower noise (1.1 nV/√Hz), but 45 MHz GBW and higher cost; requires external compensation. | Better for ultra-low-current sensor interfaces; less suitable for legacy ±15 V systems due to narrower supply range (±18 V max). | Select OPA211IDR only when sub-picoampere bias current or <1.5 nV/√Hz noise is mandatory - not a drop-in replacement. |
| AD8065ARZ | Voltage-feedback architecture, 145 MHz GBW, 180 V/µs slew rate, but higher quiescent current (7 mA vs. 8 mA typ) and no internal compensation. | Preferred for >50 MHz small-signal amplification; unsuitable for uncompensated unity-gain buffers without external RC network. | Choose AD8065ARZ for RF or video signal paths; avoid if board space or design cycle time prohibits adding compensation components. |
Compared with OPA211IDR and AD8065ARZ, the LM318DRG4 offers guaranteed internal compensation, proven reliability in industrial environments, and true pin-compatible replacement for legacy designs - trading bandwidth for simplicity and robustness in medium-speed precision analog stages.
Availability
LM318DRG4 is available at Aetrix Electronics and suitable for active filter design, sample-and-hold circuits, A/D converter front-ends, oscillator circuits, and general-purpose high-speed amplification requiring stable component supply across industrial and test equipment programs.
Supply support for LM318DRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with over 90 years of innovation in high-reliability analog ICs.
The LM318DRG4 belongs to TI's legacy precision op amp product line, engineered for demanding analog signal conditioning in instrumentation, data acquisition, and industrial control systems where speed, DC accuracy, and long-term stability are jointly essential.
FAQ
What is the maximum operating temperature range for the LM318DRG4?
The LM318DRG4 is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with its SOIC-8 packaging and internal design validation. The device's absolute maximum junction temperature is 150°C, and its thermal resistance (θJA) is 97°C/W - meaning sustained power dissipation above ~310 mW at 70°C ambient risks exceeding TJ(max). Derating is required for extended reliability in high-temperature enclosures.
Does the LM318DRG4 require external compensation capacitors to operate stably?
No - the LM318DRG4 includes internal unity-gain frequency compensation, allowing stable operation in unity-gain buffer or gain-of-2 configurations without external components. However, external capacitors may be added to Pins 1/5/8 to optimize performance: feed-forward compensation boosts slew rate in inverting modes, while overcompensation improves phase margin when maximum bandwidth is unnecessary. The internal compensation ensures baseline stability; external networks refine dynamic behavior.
Can the LM318DRG4 drive a 600 Ω load reliably?
The LM318DRG4 is characterized for RL ≥ 2 kΩ, and its output swing drops significantly below ±10 V when driving 600 Ω loads. While short-term operation is possible, continuous 600 Ω loading risks thermal overload (due to increased ICC and power dissipation) and violates the datasheet's tested conditions. For 600 Ω applications, consider buffer stages or dedicated line drivers like the THS3091 - the LM318DRG4 should be used with ≥2 kΩ loads to meet its specified slew rate, distortion, and thermal limits.
How does the LM318DRG4 compare to the LM741 in terms of speed and accuracy?
The LM318DRG4 delivers a factor-of-ten speed improvement over the LM741: 15 MHz bandwidth versus ~1 MHz, and ≥50 V/µs slew rate versus ~0.5 V/µs. Its input offset voltage (≤10 mV) is comparable to the LM741's 6 mV typical, but LM318DRG4 maintains this accuracy across temperature with tighter production spread. Unlike the LM741, the LM318DRG4 supports ±20 V supplies and includes input/output overload protection - making it suitable for modern high-fidelity analog signal paths where the LM741 would distort or saturate.
Is the LM318DRG4 RoHS compliant and lead-free?
Yes - the LM318DRG4 is RoHS compliant and lead-free, with "Green (RoHS & no Sb/Br)" eco plan designation and NIPDAU (nickel-palladium-gold) lead finish. It meets JEDEC MSL Level-1 moisture sensitivity classification and is rated for peak reflow temperatures up to 260°C. The "G4" suffix explicitly denotes TI's green packaging standard, including halogen-free materials per JS709B (<1000 ppm Cl/Br), and is fully compatible with lead-free soldering processes used in modern electronics assembly.
LM318DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 70V/µs
- Gain Bandwidth Product:
- 15 MHz
- -3db Bandwidth:
- 15 MHz
- Current - Input Bias:
- 150 nA
- Voltage - Input Offset:
- 4 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM318DRG4 FAQ
1.How can I place an order for LM318DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318DRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM318DRG4 reliable?
The price and inventory of LM318DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318DRG4 is usually 5 days.
3.What payment methods are accepted for LM318DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318DRG4?
LM318DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318DRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM318DRG4?
For technical support, including LM318DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318DRG4 requirements.
6.How does Aetrix verify that LM318DRG4 is sourced from the original manufacturer or authorized distributors?
All LM318DRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM318DRG4 meets industry standards.
7.What is the process for return or replacement of LM318DRG4?
All LM318DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM318DRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM318DRG4 part is unused and in its original packaging.
Return procedure for LM318DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM318DRG4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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